• Siemens SIRIUS 3RF31 Solid-State Relays 1-Pole 22.5 mm (25-90 A)
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Siemens SIRIUS 3RF31 Solid-State Relays 1-Pole 22.5 mm (25-90 A)

Siemens SIRIUS 3RF31 Solid-State Relays 1-Pole 22.5 mm (25-90 A)

SIRIUS 3RF31 1-pole solid-state relays in 22.5 mm width for mounting on a separate heat sink, for frequent switching of resistive loads.

Key features

  • Maximum current-carrying capacity 25 A, 50 A or 90 A
  • Operational voltage 24-230 V, 48-460 V or 48-600 V AC
  • Zero-point or instantaneous switching; high blocking voltage 1 600 V versions
  • Screw, spring-loaded or ring cable lug connection
  • Mounted on a separate heat sink (without heat sink)

Specifications

Brand Siemens
Product line SIRIUS 3RF31
Category Solid-state relay
Poles 1
Width 22.5 mm
Heat sink Not included
Catalog chapter 6 - Soft starters and solid-state switching devices
Source Siemens Catalog IC 10 · 2026, p. 562-564
3RF3125-1AA02 Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Screw
3RF3125-1AA42 Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Screw
3RF3125-1AA22 Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Screw
3RF3150-1AA02 Max current: 50 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Screw
3RF3150-1AA42 Max current: 50 A | Op voltage: 24-230 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Screw
3RF3150-1AA22 Max current: 50 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Screw
3RF3190-1AA02 Max current: 90 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Screw
3RF3190-1AA22 Max current: 90 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Screw
3RF3150-1BA22 Max current: 50 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Instantaneous | Connection: Screw
3RF3125-1AA04 Max current: 25 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Screw
3RF3125-1AA24 Max current: 25 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Screw
3RF3150-1AA04 Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Screw
3RF3150-1AA14 Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 24 V AC/DC | Switching: Zero-point | Connection: Screw
3RF3150-1AA24 Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Screw
3RF3190-1AA04 Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Screw
3RF3190-1AA24 Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Screw
3RF3125-1BA04 Max current: 25 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Instantaneous | Connection: Screw
3RF3150-1BA04 Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Instantaneous | Connection: Screw
3RF3190-1BA04 Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Instantaneous | Connection: Screw
3RF3125-1AA45 Max current: 25 A | Op voltage: 48-600 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Screw
3RF3150-1AA45 Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Screw
3RF3190-1AA45 Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Screw
3RF3190-1AA05-0KN0 Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; low power | Connection: Screw
3RF3150-1AA06 Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; high blocking voltage | Connection: Screw
3RF3150-1AA26 Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 110-230 V AC | Switching: Zero-point; high blocking voltage | Connection: Screw
3RF3190-1AA06 Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; high blocking voltage | Connection: Screw
3RF3190-1AA26 Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 110-230 V AC | Switching: Zero-point; high blocking voltage | Connection: Screw
3RF3150-1BA06 Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Instantaneous; high blocking voltage | Connection: Screw
3RF3125-2AA02 Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3125-2AA42 Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3125-2AA22 Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Spring-loaded
3RF3150-2AA02 Max current: 50 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3150-2AA22 Max current: 50 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Spring-loaded
3RF3190-2AA02 Max current: 90 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3190-2AA22 Max current: 90 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Spring-loaded
3RF3125-2AA04 Max current: 25 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3125-2AA24 Max current: 25 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Spring-loaded
3RF3150-2AA04 Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3150-2AA14 Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 24 V AC/DC | Switching: Zero-point | Connection: Spring-loaded
3RF3150-2AA24 Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Spring-loaded
3RF3190-2AA04 Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3190-2AA24 Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Spring-loaded
3RF3125-2AA45 Max current: 25 A | Op voltage: 48-600 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3150-2AA06 Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; high blocking voltage | Connection: Spring-loaded
3RF3150-2AA26 Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 110-230 V AC | Switching: Zero-point; high blocking voltage | Connection: Spring-loaded
3RF3190-2AA06 Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; high blocking voltage | Connection: Spring-loaded
3RF3190-2AA26 Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 110-230 V AC | Switching: Zero-point; high blocking voltage | Connection: Spring-loaded
3RF3125-3AA02 Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Ring cable lug
3RF3190-3AA22 Max current: 90 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Ring cable lug
3RF3150-3AA24 Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Ring cable lug
3RF3190-3AA04 Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Ring cable lug
3RF3190-3AA44 Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Ring cable lug
3RF3190-3AA24 Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Ring cable lug
3RF3150-3AA06 Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; high blocking voltage | Connection: Ring cable lug
3RF3190-3AA06 Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; high blocking voltage | Connection: Ring cable lug
Solid-State ContactorsSiemens
55 product codes available in this family
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Siemens SIRIUS 3RF31 Solid-State Relays 1-Pole 22.5 mm (25-90 A)

Brand Siemens·Solid-State Contactors

Available part numbers (55)

3RF3125-1AA02, 3RF3125-1AA42, 3RF3125-1AA22, 3RF3150-1AA02, 3RF3150-1AA42, 3RF3150-1AA22, 3RF3190-1AA02, 3RF3190-1AA22, 3RF3150-1BA22, 3RF3125-1AA04 + 45 more — see full table ↓

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Product codeSpec
3RF3125-1AA02Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Screw
3RF3125-1AA42Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Screw
3RF3125-1AA22Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Screw
3RF3150-1AA02Max current: 50 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Screw
3RF3150-1AA42Max current: 50 A | Op voltage: 24-230 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Screw
3RF3150-1AA22Max current: 50 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Screw
3RF3190-1AA02Max current: 90 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Screw
3RF3190-1AA22Max current: 90 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Screw
3RF3150-1BA22Max current: 50 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Instantaneous | Connection: Screw
3RF3125-1AA04Max current: 25 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Screw
3RF3125-1AA24Max current: 25 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Screw
3RF3150-1AA04Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Screw
3RF3150-1AA14Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 24 V AC/DC | Switching: Zero-point | Connection: Screw
3RF3150-1AA24Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Screw
3RF3190-1AA04Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Screw
3RF3190-1AA24Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Screw
3RF3125-1BA04Max current: 25 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Instantaneous | Connection: Screw
3RF3150-1BA04Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Instantaneous | Connection: Screw
3RF3190-1BA04Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Instantaneous | Connection: Screw
3RF3125-1AA45Max current: 25 A | Op voltage: 48-600 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Screw
3RF3150-1AA45Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Screw
3RF3190-1AA45Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Screw
3RF3190-1AA05-0KN0Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; low power | Connection: Screw
3RF3150-1AA06Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; high blocking voltage | Connection: Screw
3RF3150-1AA26Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 110-230 V AC | Switching: Zero-point; high blocking voltage | Connection: Screw
3RF3190-1AA06Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; high blocking voltage | Connection: Screw
3RF3190-1AA26Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 110-230 V AC | Switching: Zero-point; high blocking voltage | Connection: Screw
3RF3150-1BA06Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Instantaneous; high blocking voltage | Connection: Screw
3RF3125-2AA02Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3125-2AA42Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3125-2AA22Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Spring-loaded
3RF3150-2AA02Max current: 50 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3150-2AA22Max current: 50 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Spring-loaded
3RF3190-2AA02Max current: 90 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3190-2AA22Max current: 90 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Spring-loaded
3RF3125-2AA04Max current: 25 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3125-2AA24Max current: 25 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Spring-loaded
3RF3150-2AA04Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3150-2AA14Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 24 V AC/DC | Switching: Zero-point | Connection: Spring-loaded
3RF3150-2AA24Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Spring-loaded
3RF3190-2AA04Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3190-2AA24Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Spring-loaded
3RF3125-2AA45Max current: 25 A | Op voltage: 48-600 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Spring-loaded
3RF3150-2AA06Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; high blocking voltage | Connection: Spring-loaded
3RF3150-2AA26Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 110-230 V AC | Switching: Zero-point; high blocking voltage | Connection: Spring-loaded
3RF3190-2AA06Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; high blocking voltage | Connection: Spring-loaded
3RF3190-2AA26Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 110-230 V AC | Switching: Zero-point; high blocking voltage | Connection: Spring-loaded
3RF3125-3AA02Max current: 25 A | Op voltage: 24-230 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Ring cable lug
3RF3190-3AA22Max current: 90 A | Op voltage: 24-230 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Ring cable lug
3RF3150-3AA24Max current: 50 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Ring cable lug
3RF3190-3AA04Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 24 V DC | Switching: Zero-point | Connection: Ring cable lug
3RF3190-3AA44Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 4-30 V DC | Switching: Zero-point | Connection: Ring cable lug
3RF3190-3AA24Max current: 90 A | Op voltage: 48-460 V AC | Control supply: 110-230 V AC | Switching: Zero-point | Connection: Ring cable lug
3RF3150-3AA06Max current: 50 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; high blocking voltage | Connection: Ring cable lug
3RF3190-3AA06Max current: 90 A | Op voltage: 48-600 V AC | Control supply: 24 V DC | Switching: Zero-point; high blocking voltage | Connection: Ring cable lug

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